166870859 has 2 divisors, whose sum is σ = 166870860. Its totient is φ = 166870858.

The previous prime is 166870841. The next prime is 166870867. The reversal of 166870859 is 958078661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166870859 - 2¹⁶ = 166805323 is a prime.

It is not a weakly prime, because it can be changed into another prime (166876859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83435429 + 83435430.

It is an arithmetic number, because the mean of its divisors is an integer number (83435430).

Almost surely, 2^166870859 is an apocalyptic number.

166870859 is a deficient number, since it is larger than the sum of its proper divisors (1).

166870859 is an equidigital number, since it uses as much as digits as its factorization.

166870859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 166870859 is about 12917.8504016729. The cubic root of 166870859 is about 550.5458591732.

It can be divided in two parts, 1668 and 70859, that added together give a palindrome (72527).

The spelling of 166870859 in words is "one hundred sixty-six million, eight hundred seventy thousand, eight hundred fifty-nine".